Silphium confertifolium

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Distribution Map: Based on vouchered plant specimens only. View county names by placing the mouse cursor over a particular county.

Species Distribution Map
Family:ASTERACEAE
Species:Silphium confertifolium Small
Common Name:Blackbelt Rosinweed
Habitat:**
Associated Ecological Communities:**
Growth Habit:Herb
Duration:Perennial
Category:Vascular
USDA Symbol:**
Plant Notes:Blackbelt Rosinweed is a native herbaceous perennial in the Sunflower family (Asteraceae). It can be found in the northern 2/3’s of Alabama. Blackbelt Rosinweed is found on chalk prairies, on cedar glades, on marl outcrops, and on roadside banks. It often occurs in areas with thin soils derived from limestone. It is a perennial with a short rhizome. The stems are 1-3 feet in height, unbranched below the inflorescence, green in color, and glabrous. Leaves are basal and cauline. The basal leaves are large and present at flowering. Basal leaves are petiolate, elliptic to lanceolate in outline, entire, and glabrous except for cilia along the margins. Stem leaves are opposite, sessile, entire, glabrous, and quickly reduced in size upwards. Flowers are produced in heads. The heads are arranged in corymbs. The heads are small for the genus. Each head has 8-13 yellow ray flowers and 35–100 yellow disc flowers. The fruit is an achene. Blackbelt Rosinweed is sometimes treated as a variety of the widespread Starry Rosinweed (Silphium asteriscus Linnaeus var. latifolium (A. Gray) J. A. Clevinger). It differs from that species by its shorter stature, smaller head size, and persistent large basal leaves.--A. Diamond
Taxonomic Notes:**
Status:Native, S3 (State Rank), G2 (Global Rank)
References:**
Specimen: View specimen details in the Alabama Herbarium Consortium Specimen Database

** Not applicable or data not available.

Classification

FamilyASTERACEAE - Aster family
Genus Silphium
Species Silphium confertifolium Small - Blackbelt Rosinweed

Citation

Citation Silphium confertifolium Small, Fl. S.E. U.S. 1243, 1340. 1903.
Basionym: **
Type: ALABAMA: Choctaw Co.: Cocoa, 13 Oct 1896, Schuchert s.n. (holotype: NY).

** Not applicable or data not available.

Synonyms

No synonyms exist for this species.

Specimens and Distribution

This species has been reported in the following counties by the herbaria listed. An overview of the individual specimens are provided in the table that follows. Click on the accession number to view details; click on column headers to sort; choose a county or herbaria to filter the specimen data.

Counties included on distribution map: Autauga, Barbour, Bibb, Blount, Bullock, Calhoun, Cherokee, Chilton, Choctaw, Coosa, Cullman, Fayette, Franklin, Greene, Jefferson, Lauderdale, Lawrence, Lowndes, Macon, Marengo, Marshall, Montgomery, Morgan, Pike, Shelby, St. Clair, Sumter, Talladega, Tuscaloosa, Wilcox, Winston

Counties represented by specimen data listed below:

Herbaria represented by specimen data listed below: ALNHS, AMAL, AUA, JSU, TROY, UNA, UWAL

Range of years during which specimens were collected: 2019 - 2021

Barcode / Accession No.
County
Coll. Date
Collector &
Collection No.
Herbarium &
Herbarium Name Used
Image
AUA000007404 Autauga 15 Jun 1982 GUNN, SCOTT C.
722		 AUA
SILPHIUM ASTERISCUS L. VAR. LATIFOLIUM (GRAY) J. A. CLEVINGER
AUA000007277 Barbour 29 Jul 1970 MOORE, HAROLD D.
423		 AUA
SILPHIUM ASTERISCUS L. VAR. LATIFOLIUM (GRAY) J. A. CLEVINGER
AUA000007405 Bibb 20 Sep 1976 SESSLER, ANN H.
763		 AUA
SILPHIUM ASTERISCUS L. VAR. LATIFOLIUM (GRAY) J. A. CLEVINGER
UWAL0053209 Bibb 24 Jul 2019 Keener, Brian R.
11444		 UWAL
Silphium asteriscus L. var. latifolium (A. Gray) J.A. Clevinger
UWAL0053210 Bibb 24 Jul 2019 Keener, Brian R.
11445		 UWAL
Silphium asteriscus L. var. latifolium (A. Gray) J.A. Clevinger
UNA00064840 Blount 01 Aug 1998 Keener, Brian R.
1375		 UNA
Silphium asteriscus L. subsp. latifolium (A. Gray) J. A. Clevinger
UWAL0009294 Blount 01 Aug 1998 Keener, Brian R.
1375		 UWAL
Silphium asteriscus L. ssp. latifolium (A. Gray) J.A. Clevinger
UWAL0014805 Bullock 31 Aug 2012 Dykes, Bailee
1168		 UWAL
Silphium confertifolium Small
TROY000036139 Bullock 31 Aug 2012 Dykes, Bailee
1168		 TROY
Silphium confertifolium Small
UWAL0045558 Bullock 31 Jul 2016 Horne, Howard E.
3471		 UWAL
Silphium asteriscus Linnaeus var. latifolium (A. Gray) J.A. Clevinger
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